When can the commission for a ticket be negative?

When an affiliate returns a previously booked and paid-for ticket, a negative commission appears in the statistics list, reducing the overall commission amount.

For example, a ticket was bought on 15 February 2014 and the affiliate earned a commission of $10. However, on 25 February 2014, the ticket was refunded. In this case, the statistics for 25 February 2014 will show a commission of “- $10” (negative).